Updating PySP tests

[jsiirola]

Summary/Motivation:

This should resolve the last of the failing tests in Jenkins (Pyomo_trunk). This PR requires PyUtilib/pyutilib#47.

Changes proposed in this PR:

• Updating up 1 baseline
• Marking 3 tests as fragile
• Cleaning up numeric tolerances (enabled by File comparison fixes PyUtilib/pyutilib#47)

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[codecov-io]

Codecov Report

Merging #788 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #788      +/-   ##
==========================================
- Coverage   66.92%   66.91%   -0.01%     
==========================================
  Files         421      421              
  Lines       66713    66713              
==========================================
- Hits        44646    44644       -2     
- Misses      22067    22069       +2

Impacted Files	Coverage Δ
pyomo/pysp/ph.py	61.15% <0%> (-0.1%)	⬇️

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[blnicho]

I think this looks fine, just minor changes to PySP tests. It would be great to have a PySP developer take a quick look at this before merging but I don't think it's absolutely required since we discussed these changes with them at the Pyomo dev meeting yesterday.